You have to basically try to find out what x is. You Subtract 7.72 by 7.72 and by 19. So, you'll be left over with 7.72x/7.72= 7.72/11.28. And so x= 11.28

[latex]x + 7.72 = 19[/latex] -7.72 -7.72 [latex]x = 11.28[/latex]